Flat Galaxies of the RFGC Catalog Detected in the HIPASS Survey

Details Flat Galaxies of the RFGC Catalog Detected in the HIPASS Survey Flat Galaxies of the RFGC Catalog Detected in the HIPASS Survey

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ap.....45..448k&link_type=abstract

Astrophysics (English translation of Astrofizika), v. 45, Issue 4, p. 448-457 (2002).

Astronomy and Astrophysics

Astrophysics

1

Galaxies - Galaxies Spirals - Galaxies Radial Velocities - Galaxies General

Scientific paper

Data from the H I Parkes All-Sky Survey (HIPASS) of the southern sky in the neutral hydrogen line are used to determine the radial velocities and widths of the H I line for flat spiral galaxies of the Revised Flat-Galaxy Catalog (RFGC) seen edge-on. The sample of 103 flat galaxies detected in HIPASS is characterized by a median radial velocity of +2037 km/sec and a median width of the H I line at the level of 50% of maximum of 242 km/sec. For RFGC galaxies the 50% detection level in HIPASS corresponds to an apparent magnitude B t = 14 m .5 or an angular diameter a = 2.9. The relative number of detected galaxies increases from 2% for the morphological types Sbc and Sc to 41% for the type Sm. The median value of the ratio of hydrogen mass to total mass for RFGC galaxies is 0.079. With allowance for the average internal extinction for edge-on galaxies, B t m .75, the median ratio of hydrogen mass to luminosity, M H I/L B = 0.74 M &sun;/L &sun;, is typical for late-type spirals. Because of its small depth, HIPASS reveals only a few RFGC galaxies with previously unknown velocities and line widths.

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